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Define the active and passive immunization

Define the active and passive immunization. According to the period of the protection how do these kind of immunization differ?

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Active immunization is that in which an antigen goes through the body activating the inital immune response and the making of memory lymphocytes and antibodies that offer faster and extra effective immune defense in future infections by that particular antigen. In case of

Passive immunization immunoglobulins in opposition to an antigen are inoculated in the human body to give protection just in case the body becomes infected because of that antigen. Active immunization is likely to be longer lasting comparatively passive immunization because in the active type as well as antibodies, particular memory lymphocytes stay in the circulation. In case of passive immunization the duration of the defence is that of the period of the antibodies in the circulation.

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